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Yanagisawa, Kayo; Ikarugi, Riko; Morii, Shiori; Oka, Toshitaka; Kitatsuji, Yoshihiro; Fukaya, Hiroyuki; Haraga, Tomoko; Otake, Yoshinori; Tambo, Masaki; Inada, Arisa; et al.
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no abstracts in English
Tambo, Masaki; Fukaya, Hiroyuki; Kobayashi, Fuyumi; Otake, Yoshinori; Inada, Arisa; Mizokami, Masato*; Mizokami, Shinya*; Nakamura, Satoshi; Kitagaki, Toru; Takano, Masahide
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no abstracts in English
Otake, Yoshinori; Kabir, M.*; Fukaya, Hiroyuki; Tambo, Masaki; Inada, Arisa
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The widespread distribution of radioactive cesium resulting from the Fukushima Daiichi Nuclear Power Station accident poses a serious challenge in decontamination and waste management. Recognizing the critical importance of addressing this issue, JAEA recently launched a project to develop human resources and improve or validate existing technologies related to elemental and radionuclide analysis. Among these challenges, the safe and efficient disposal of incineration ash generated by burning cesium-contaminated combustible waste has become particularly urgent. Ash with activity levels exceeding 8,000 Bq/kg is temporarily stored as controlled waste, and there is an immediate need to establish an effective treatment method. Conventional chemical and physical techniques for radioactive substance separation involve system complexity and high operational costs, underscoring the demand for simpler and more energy-efficient alternatives. In this study, we evaluated the applicability of an electrokinetic technique - the Flat Electrode Method-ElectroKinetic (FEM-EK) process- which has been proven effective in removing cesium from soil and separating radioactive cesium from incineration ash generated during decontamination. Cesium distribution in the samples was characterized using a germanium semiconductor detector, which provided insights into cesium migration behavior before and after treatment. This presentation reports the results of electrokinetic experiments performed with both simulated and actual incineration ash, together with evaluations of cesium migration within the samples after treatment.
Tambo, Masaki; Fukaya, Hiroyuki; Kobayashi, Fuyumi; Inada, Arisa; Mizokami, Masato*; Mizokami, Shinya*; Banjarnahor, I. M.; Kitagaki, Toru; Ikeuchi, Hirotomo
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no abstracts in English
Otake, Yoshinori; Tambo, Masaki; Kabir, M.*; Inada, Arisa; Fukaya, Hiroyuki; Kida, Takashi
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In March 2011, a large amount of radioactive cesium (hereinafter referred to as Cs) was dispersed over a wide area as a result of Fukushima Daiichi Nuclear Power Station accident after the devastating earthquake that occurred in Japan. The incinerated ash containing Cs generated by environmental decontamination has become a problem due to lack of storage space. The purpose of this study is to reduce the volume of designated waste that needs to be preserved by removing Cs from incinerator ash using Electrokinetic (EK) method. Two electrodes are placed in the polluted materials (i.e. incinerator ash for this study) with electrolyte solution and a DC voltage is applied in between the electrodes. It can be understood that the Cs ions will move to the cathode side and thus it will be removed from the incinerator ash. At first, a preliminary experiment was conducted with commercially available ash polluted with stable Cs with the concentration ratio 50 mg/kg. We found that more than 80% of stable Cs was separated from the ash with the EK treatment. Then we performed the EK treatment with two types of radioactive contaminated ashes (i.e. fly ash and bottom ash). The radioactive concentration of Cs was about 3,000 Bq/kg to 5,000 Bq/kg for the ashes. We succeeded in the separation of Cs from the ashes. Further works will be carried out with various test conditions, such as, the type of electrolyte and the structure of the test apparatus etc.
Kitatsuji, Yoshihiro; Fukaya, Hiroyuki; Haraga, Tomoko; Oka, Toshitaka; Otake, Yoshinori; Tambo, Masaki; Inada, Arisa; Aono, Ryuji; Kinase, Akari; Ikarugi, Riko; et al.
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To proceed with the decommissioning of Fukushima Daiichi Nuclear Power Station Accident (1F), it is necessary to secure human resources for radionuclide analysis, which is a prerequisite for the safe treatment and disposal of treated water and waste containing radionuclides generated as a result of the decommissioning. The Nuclear Science Research Institute of JAEA, together with the Fukushima Research and Engineering Institute, has started a project to train analytical personnel who will be responsible for decommissioning in the future. In this presentation, we will introduce the training of analytical operators, managers, and engineers for young staff members and our efforts using the summer intern program.